/* Optional popup styles */
.popup-message {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 20px;
    border-radius: 10px;
    z-index: 1000;
    background-color: #4CAF50; /* Default success color */
    color: white;
    font-size: 1.2em;
    text-align: center;
}

.popup-message.error {
    background-color: #f44336; /* Error color */
}